GB/T 1591 Q420C Introduce
Steel is an essential material in construction and engineering, and it is important to have a common understanding of how different steel grades are used. The Chinese government set the standard for steel classification in China with the introduction of the GB/T 1591 steel standard. This standard is designed to improve the industrialization of steel and safeguard China's economic and environmental interests.
Smelting temperature:1789°C - 1915°C
Application:Low alloy high strength structural steel
GB/T 1591 Q420C Material Mechanical Properties
Toughness is another important property of GB/T 1591 Q420C steel. It is determined by the impact energy absorbed during fracture tests, using a Charpy, Izod or tension tests. Generally speaking, the lower the grade, the better the toughness.
The mechanical properties of the GB/T 1591 Q420C steel are as follows:
| YieldRp0.2 | ≤ 591 (MPa) |
| TeileRm | ≤ 536 (MPa) |
| ImpactKV/Ku | 33(J) |
| ElongationA | 23% |
| Reduction in cross section on fractureZ | 32% |
| As-Heat-Treated Condition | Solution and Aging, Annealing, Ausaging, Q+T,etc |
| Brinell hardness (HBW) | 431 |
GB/T 1591 Q420C Material Thermal Properties
The thermal performance parameters of the GB/T 1591 Q420C steel are as follows:
| Temperature (°C) | 14 | 434 | 649 |
| Modulus of elasticity (GPa) | - | 877 | - |
| Mean coefficient of thermal expaion ×10-6/(°C) | - | - | 22 |
| Thermal conductivity (W/m·°C) | - | 14.3 | 22.2 |
| Specific thermal capacity (J/kg·°C) | - | 433 | - |
| Specific electrical resistivity (Ω mm²/m) | 0.33 | - | - |
| Deity (kg/dm³) | - | - | 124 |
| Poisson’s coefficient, ν | - | - | 212 |
GB/T 1591 Q420C Material Machining Technology
GB/T 1591 Q420C has a wide range of applications, including bridges, transport vehicles, buildings, machinery, pipelines, lifting and technical conveying facilities, heavy lifting and lifting equipment, etc., vehicles, container reinforcements, shipbuilding, construction, large-scale drilling platforms, and architectural structures, such as high-voltage transmission towers, steel structures. Grades such as materials are used.